body {
    font-family: 'Arial', sans-serif;
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
    color: #2c3e50;
    text-align: center;
}

.input-group {
    display: flex;
    gap: 10px;
    margin: 20px 0;
}

input[type="text"] {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

button {
    padding: 10px 20px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background-color: #2980b9;
}

#result, #error {
    padding: 15px;
    margin: 15px 0;
    border-radius: 5px;
}

#result {
    background-color: #dff0d8;
    border: 1px solid #d6e9c6;
    color: #3c763d;
}

#error {
    background-color: #f2dede;
    border: 1px solid #ebccd1;
    color: #a94442;
}

.instructions {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    margin: 20px 0;
    color: #6c757d;
}
